I have no problem with individuals smoking in their own, sealed, areas. In their homes, or their autos (though I do think that requiring full disclosure about whether a smoker owned the car is a good thing at resale time).

But public areas are subject to regulation for the public good, and in those spaces, I support a full ban on tobacco.

Similarly for marijuana, by the way -- with the addition of regulations about operating heavy machinery and other safety concerns under the influence, paralleling the ones for alcohol.